Longman Dictionary of Contemporary English homepage

ignorance

 noun
     
ig‧no‧rance [uncountable]
1 lack of knowledge or information about something:
Excuse my ignorance, but how does it actually work?
ignorance of
our ignorance of the true situation
in ignorance
I would have remained in ignorance if Shaun hadn't mentioned it.
ignorance about
public fear and ignorance about AIDS
2

ignorance is bliss

used to say that if you do not know about a problem, you cannot worry about it
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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